Learn .NET MAUI by Building: An AI-Powered App in C# for Android and Windows (C#/.NET in Practice Book 4)

It doesn't stop at Hello, World. Starting from an empty project, you build one store-ready app all the way to the end.

You can write C#, but the moment it becomes a phone app you stall — you cross that first step by building and running. The subject is just one app: Kotsukotsu, a habit tracker with an AI coach. Every chapter builds on the same codebase, so it never turns into a pile of disconnected samples.

With .NET MAUI, one C# codebase targets Android, iOS, Windows, and macOS. This book centers on Android, and you can start today with a single Windows PC.

What you'll learn - Set up your environment and launch your first app on both platforms

- A list, an input form, and localization; separating UI and logic with MVVM

- Saving data, and a screen that counts your streak

- Notifications, networking, and the centerpiece — an AI coach built in C# alone

- Polish, distribution, store release, and ads

Who this is for - Developers who know the C# basics and want to build a working phone app

- Developers who want to extend their Windows or server-side C# to mobile

- Developers moving from Xamarin.Forms to .NET MAUI

C#/.NET in Practice series This book is part of the C#/.NET in Practice series. Its companion Building Desktop Apps with C# and WinUI 3 builds a Windows desktop app in the same C#. Each volume stands on its own.

The finished source is on GitHub.